I don't think there's a way to do it between pages with JavaScript - that I can remember anyway... I think you'd need some kind of session.

On the same page, to make it pop up only once you could do something like...

Code: Select all

 function pop() {
  if (done!=1) {
        alert("hey you! eggburger! farts!");
    done=1;
  }
}

Just off the top of my head after I haven't used it for a while - so there are probably much better solutions out there!